I have two sites that are connected via an always on Firewall VPN connection. Behind the firewall in Site A (HQ) is a Cisco Switch, behind the firewall in Site B (Branch) is a Netgear managed switch.
If I run an iperf test between two Windows based systems, one in each site, I see large packet losses of 1-5%.
If I plug directly into the HQ firewall and perform the same test, I see results of 0% - .3%, data loss.
I imagine if I plugged the branch client directly into the firewall, I would see 0% data loss when running iperf as expected.
I have been told that with the network loaded (switches, clients) on both sides I should see zero loss between sites. My thought is there is an issue with the switch configuration, but I am not sure what? Am I on the right track or should I be looking at something else?